title: Bovine aortic chondroitin sulphate- and dermatan sulphate-containing proteoglycans. Isolation, fractionation and chemical characterization.
abstract: 1. Guanidinium chloride (4M) in the presence of proteinase inhibitors extracted 90% of bovine aorta galactosaminoglycans as proteoglycans that were subsequently purified by ion-exchange and gel chromatography. 2. Fractionation of the calcium salts of the purified proteoglycans with increasing concentration of ethanol yielded fractions PG-25 (28%), PG-35 (45%) and PG-50 (37%). 3. Fraction PG-50 contained proteochondroitin 6-sulphate, whereas fractions PG-25 and PG-35 were proteodermatan sulphates of greatly different carbohydrate composition; the molar proportions of L-iduronate-N-acetylgalactosamine 4-sulphate, D-glucuronate-N-acetyl-galactosamine 4-sulphate and D-glucuronate-N-acetylgalactosamine 6-sulphate were 75: 18 :7 in fraction PG-25 and 14 :46 :40 in fraction PG-35. 4. The presence of alternating or mixed sequences with L-iduronate- and D-glucuronate-containing repeating disaccharides was indicated by the formation of tetrasaccharides after chondroitinase AC digestion (single L-iduronate residues) and by the release of fragments containing four or five consecutive D-glucuronate-N-acetylgalactosamine repeats after periodate oxidation and alkaline elimination. 5. The amino acid compositions of fractions PG-25 and PG-35 were similar and markedly different from that of fraction PG-50, which also contained more side chains.
mesh_terms: D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001011:Aorta / Q000032:analysis*; D002417:Cattle; D055598:Chemical Phenomena; D002621:Chemistry; D002807:Chondroitin / Q000031:analogs & derivatives*; D002809:Chondroitin Sulfates / Q000032:analysis*; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003871:Dermatan Sulfate / Q000032:analysis*; D004187:Disaccharides / Q000032:analysis; D019791:Guanidine; D006146:Guanidines; D011480:Protease Inhibitors; D011509:Proteoglycans / Q000302:isolation & purification
chemical_list: D000596:Amino Acids; D004187:Disaccharides; D006146:Guanidines; D011480:Protease Inhibitors; D011509:Proteoglycans; D003871:Dermatan Sulfate; D002807:Chondroitin; D002809:Chondroitin Sulfates; D019791:Guanidine